Photovoltaic power generation system

Abstract

A solar cell array having an exposed electroactive portion is connected to a system power supply through an insulation transformer, a ground-fault interrupter is provided between the solar cell array and the system power supply, and a ground-fault detector is provided at the grounded line of the solar cell array. A set current value at which the ground-fault detector judges a ground-fault is larger than an amount of a set current value at which the ground-fault interrupter interrupts a circuit. The insulation transformer is provided between the solar cell array and the system power supply. Owing to such structure, the present invention aims at the simplification of environment-resistive coating having a large ratio of cost of the solar cell, and the simplification of insulating coating of members that connect the solar cells in series and parallel, and provides a photovoltaic power generation system which does not stop by the leakage current of the electroactive portion in connection with such simplification of the environment-resistive coating and insulating coating.

What is claimed is:  
     
       1. A photovoltaic power generation system comprising: 
       a solar cell array having a plurality of solar cells electrically connected to each other with a wiring member;  
       a power conditioner for converting an output from the solar cell array into AC power;  
       an insulation transformer provided between the solar cell array and a power system;  
       a ground-fault interrupter provided between the power conditioner and the power system; and  
       a ground-fault detector for detecting a ground-fault of the solar cell array,  
       wherein a part of at least one of an electroactive portion of the plurality of solar cells and an electroactive portion of the wiring member is exposed to the outside, wherein a line of the solar cell array is grounded, wherein the ground-fault detector is provided at the grounded line, and wherein a set current value at which the ground-fault detector judges a ground-fault is larger than a set current value at which the ground-fault interrupter interrupts.  
     
     
       2. The system according to  claim 1 , wherein, when a leakage current Ir (A) flows in a current route from the at least one of the electroactive portions to the ground while the solar cell array operates in a moist state, the set current value of the ground-fault detector is larger than Ir, and the set current value of the ground-fault interrupter is smaller than Ir. 
     
     
       3. The system according to  claim 1 , wherein a positive electrode terminal of the solar cell array is grounded. 
     
     
       4. The system according to  claim 1 , wherein a negative electrode terminal of the solar cell array is grounded. 
     
     
       5. The system according to  claim 1 , wherein the line is grounded so that a ratio of an absolute value of a voltage between a positive electrode terminal of the solar cell array and the ground to an absolute value of a voltage between a negative electrode terminal of the solar cell array and the ground becomes approximately 2:1. 
     
     
       6. The system according to  claim 1 , wherein each of the solar cells comprises a photoelectric conversion layer, a collecting electrode arranged on side of a light-receiving surface of the photoelectric conversion layer, a surface wiring member and a coating member, and has an exposed portion, which is not coated with the coating member, in a part of the collecting electrode or the surface wiring member. 
     
     
       7. The system according to  claim 6 , wherein the coating member is composed of a resin and formed by coating. 
     
     
       8. The system according to  claim 1 , wherein a part of at least one of an electrode, arranged on a side of light-receiving surfaces of the plurality of sol cells, and the wiring member is not put in a solar cell envelope. 
     
     
       9. The system according to  claim 1 , wherein the sol cell array is installed on a supporting member. 
     
     
       10. The system according to  claim 9 , wherein the supporting member is a concrete stand.